Less sensitivity to pin or light touch in the arm. May correspond to anatomical distribution such as ulnar or median nerve, or perhaps cervical anatomical correlates. May be localized using standard testing. Causes are multiple.
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7

Holter?:
Waking up with arm numbness that resolves in a few minutes is a common and normal occurrence. It's due to compressionneuropathy from positioning during sleep. Getting up and moving around relieves it. For your heart pounding, ask to wear a 24 hour Holter (heart) monitor to see what your heart is doing when you awaken. Many people have a.m. anxiety which results in fast but normal HR till calm.
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Sleeping on your arm:
Puts a great deal of pressure on your rotator cuff and drives the cuff up into your shoulder blade and collarbone. It is akin to someone clamping you thigh for eight hours it is going to hurt. Furthermore your ac joint also can become inflamed. Finally the nerves in you arm get stretched and irritated. Try sleeping in a recliner, wear a shoulder immobilizer, or sleep with your back supported.
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Not really:
If it is happening while asleep, I do not know how you feel those experiences. In any case if this is not happening all the time particularly while awake, it is most likely some benign process. Even if it is happening all the time it is sign of what we call peripheral neuropathy which is caused by multiple condition. Diabetes is by far the most common cause
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10

U*nlikely:
If ganglions occur within the carpal canal it can cause you to develop carpal tunnel syndrome, numbness in the thumb and fingers supplied by the median nerve. But not the arms. Could also effect the ulnar nerve if ganglion occurs in guyons canal. If you have numbness in the arms you should seek evaluation with a neurologist.
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11

Multiple causes:
There are multiple causes, ranging from carpal tunnel syndrome to cervical spine disease to metabolic issues such as diabetes mellitus and thyroid trouble. Your pcp and/or a neurologist can help to narrow down the possibilities and guide treatment.
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14

Xarelto:
Yes. Numbness is reported as most common sideffect. Pain is reported as less common side effect. I woud suggest talk to your doctor and switch to alternative blood thinners. If your symptoms are from xarelto you should get relief.
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15

Rule out heart first:
Number one cause in seriousness is heart disease / attack. If you haven't checked this out, do so right away. Other causes include pinched nerve in neck, shoulder injury, overuse syndrome of left arm, thoracic outlet syndrome, blockage of axillary artery.
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17

No:
I don't think that anxiety would single out the left arm like that. If you get true intermittent numbness and heaviness and/or weakness of the left arm, I recommend en evaluation by a neurologist to check for problems with nerve impingement, circulatory problem, etc.
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18

Sinusitis:
Sinusitis on the sphenoid sinuses will cause headache in the center of the head. But is you have numbness in the arm and cheek is a good idea to visit your doctor to rule out any other problems. Hope this helps. www. Otwithmd. Com.
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22

Many things:
The two are not necessarily related. Heart flutter, if you mean sensations of fluttering in the chest, can be caused by an abnormal heart rhythm. But palpitatios can occur even if the rhythm is regular. Numbness of an arm is commonly caused by pressure on a nerve which can occur in the neck, elbow, or wrist. Occasionally, arm numbness can occur with heart chest pain. Also can occur with stroke.
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24

Numb:
We worry about "thoracic outlet syndrome" but the person to best help is an orthopedic doctor. You might need an EMG by a neurologist as well. Start with the orthopedic doctor first. If you are displease with their plans, seek a neurologist.
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25

Impingements:
Intermittent nervecompression can cause. Pinching occurs at costoclavicular dimension, true thoracic outlet. Raising arm unconsciously during sleep causes this space to close by a few millimeters, pinching main nerve ; artery to arm. Ulnar parasthesias (crawly tingling feelings) occur in pinky side of hand. This dynamic is called thoracic outlet syndrome (tos). See my discussion at quora. Com.
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27

PRESSURE ON NERVES:
Pain in neck radiating down the arm usually is from pressure on the nerves that originate from the neck you need to be evaluated by your doctor or an ortopedic specialist, you need exam and may need MRI exam to find the cause. You are only 34 years old so see your doc.
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29

It all depends.:
Muscle strain/sprain are injuries to the muscle tissue that can be very painful. Some muscle injuries can cause trigger sensation which will cause pain to radiate to different areas. This are trigger points. Now, a low back injury will not cause hand numbness. Other pathologies should be ruled out and a complete physical examination and likely imaging studies should be perform if symptoms persit
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Sleep is a topic that involves concepts such as how long it takes to fall asleep, how many times one wakes up at night, how many hours one sleeps at night, sleep stages, dream sleep, snoring, etc
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